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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b04c2c9b1a7630ae6300b90b9f4a3acc3d0d699add86c65d3fcce3613da0886e' 
  AND token = 'Nj5gxTts6Q77gp+k63fDjMbASkdhjRPQsC4Zp6jA008=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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