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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4b47149de6fa93ecb79a72c3ea0c646fbabc7f48caf8e1f4771fbab329544dc' 
  AND token = 'i1jEWRgie5o/ltjkAAVfLYGUBQ8E7RXWQMEQw61Apq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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