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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca7a6b9a9e25bf2af1ed564a2acf79cce153a0abdb2c14ea5b20597013cfda01' 
  AND token = 'ykljf3VHTSHzaeObp8a0TXHYD8IlGQOw1mXABheCc/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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