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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94a6a1b828c84d41a01ac74f562f0e86da77dc419e7449877b0fa1a174f181ad' 
  AND token = 'U4VY1U3hSxTRSas5xqtm6EWNIqeQXRhqtHWWz8lm0J8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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