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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dd7ca7c6251705f0e44d1d7f53e50f3f33aa8b604c67675661a7aabbfc8f8f2' 
  AND token = 'nL+gJyA4su1IyWgNP2YNEGbCcqdQY2WNzd8SkrfTMu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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