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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9931c5a1616590a771c08682b3feb603d6d2cfa9a77d48c97677f8b6ab051c6e' 
  AND token = 'J/Jlxh/A2r/qbQ8ufxxlrdSN5N9HHpIL9v1nR+gjliM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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