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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ad9cc853fd0c91360c334f301d46e31cedad3210a38a400214432bc13809e32' 
  AND token = 'xVdbOD0dhGo8LcDbqV3JOFOfb+K0xFX/tpZH93kKFlo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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