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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7e1bbffe9ae575847bdf9e8558ec4921416794a036ee837ba32e61e22329f2e' 
  AND token = 'SkvOii/8k3zhx4PVvUH3ZAvm2CxSh1zx358jGrURFdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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