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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a83a82ee9db0885265dacb2ef4220cf10b9cca87211b5ae96e7e4d1bdfe0d6a' 
  AND token = '1Pc0Cowb1Do4NGJDk2tIIOfDrnXt4/RCAk3Bh5S3N+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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