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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7a73c1ad229bfa5e20cddf0561fc21aeeb402f909eae7467169bcc998c5296c' 
  AND token = 'yWaHvdLC60MMnDumTb9s/O34LVQxBw47yZxxVaERALs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00102

JSON explain

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