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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7d7236f9bf7236329c4d0f6e92a45d16aab907fd8b7a2f1c4c238d6a76f086c' 
  AND token = 'BdUim5rKs8ZmhXpTD9uaDu+EGAD8JkyXh6fuNmTjZaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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