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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cd1e67a8c9796f159cf1f71e2e9e67cd3d1da5d8874b981ff526072927afcfd' 
  AND token = '9/s1Si6kDuR6HoPgQkS2h97mxKgWAOmij1mh6ucdGw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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