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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ddac2f2ff8d4648b4cf121c38d9687a8eced538756ac5c22110b767de7fe2bb' 
  AND token = 'H+Cl4+jSo187DKd3zdcDlxz9DNhHSRUeoK8vf1t/J5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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