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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e5a5405c20947ba5ab32eb507b5e85874831e0564e1e5df4efa4440cd86045a' 
  AND token = 'SB9vXK2F/ugElSSRa9aAU4efY8mZDkB/LSX6SExVhGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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