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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '557a22931df3d1d03244fdfe9ac97b3384ff94b4441cf66100eaeecd8039f4a9' 
  AND token = 'gvk3YoldkRV1VmCGeE798Vl6KNt3pRGE+GhgsLc+2Ns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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