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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69dfc26a58890990bf9aeda0f3ee851525ac2fb2203812bd9efb471996275d4d' 
  AND token = '6sNw8i1KYaVcTKCRGwEwNZ/H0OS8KsaCTgjp1u7nwh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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