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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ceea757263d0dc0c4e9a9fbaf670ac67d0432c3cf7a63997283a6930c760b745' 
  AND token = 'h03t9JWE6vP+cCFlW0sU9puQKalhVfbsSfa4lvCUNlo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00113

JSON explain

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