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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '271558769b1c9c1fa049b67b75585a42784a90dbc631fa316743654f77c54fea' 
  AND token = 'U6rQyHym0jbaCVIzl1O2RpdZ7ONvC9i1aAz0CJj3N6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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