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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0775aa757a4a49f1b6d8428f45a67b041bb1f4c41c1d0e3693ab71e23987702e' 
  AND token = '8rioHEjp2/jE2D/Tp9X4LHyqhoKTZf0a1D21l/goAgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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