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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05acf17b20166693e52a4e1583ab4e9f70830cb893ada176bf85ea67b6f0f093' 
  AND token = 'RCE5q5UOz7TtVj1y1+yOPoUd/Yjz4kQ2PETl5gENQlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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