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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41e62abc43722d1b6618efdf2c4f7a28685b4b8d98b7c49f8fd5a4d3fb2932fa' 
  AND token = '+VjxBof/VHO3rqx6V/8DuFDPCvS9Prc3lFjsDVSc/H0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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