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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d0dfb8afd38cd3cf13cadc3687f8974a8dc026e00a96ad5060e266259880a0a' 
  AND token = '85Zo75Q45APIVATxYOPHuU0InCEAaUenIkHEjE269v8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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