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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce6429a57f1641da076d4757a2fa2d4b260361925808e258391512d0e32afa47' 
  AND token = 'p5cIXisek9uC9bPvLZxwAqbBF3AQ+6x1OzlYQu8Wwu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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