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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3ad58c77414e92d028325d402eb24f5c0c5f1efb7d203880413d40b457928fc' 
  AND token = 'FvXWJwiOSgdrcuR8pQsqEG3ZivDdvD/M0NwcfL5d/4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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