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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da92b22f491a7c60095ba3b640d52e3e80ece7273454846680737fbc05acfe2f' 
  AND token = 'D5O2GNE4AZosZ1NxQsUOGlQBRRf9+HbOHkbQpXYFk1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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