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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e7337745c740d28448ed6732e538eceba5c522eb7960c2a7294e723e632379c' 
  AND token = 'V+DXi01vvTHkjcrdzXa4tDzr6axADkTr8StsW7z1/HQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00104

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}