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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6e7e25f7add97752f22b3ffe3e9b74ef2d60852d264b65919bd9f98e3c00dcf' 
  AND token = '4bAFsK77zyXT5jO3wW0zOWSLgD+IkTfJAGy48k5xbes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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