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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca9a390578ecf6a741fb32eb7ec118e8e8eee00eefed85ba4911eb23402f4cad' 
  AND token = 'xfEBonKwk1H8cBXgyLlDTBEhirDh7pwolpuB+Pse0Q4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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