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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8755ed24c13be2f3b4ef9eb617f8f208f96ca5d9a0c7d91cde6e2e752af2fca3' 
  AND token = '7dgYU8Xm4q1tRSWNEBwLBcjBHV1BwE1kt62v/HS7iuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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