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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2bb4d59e4ffd18b9f4f96c68ea63edfb7bdb7a396d02782d774491baa8f211a' 
  AND token = 'EASVqbNDirfJaIlSpywVSNwm7I/zXMQZvTSY2V8RlT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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