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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '358249ae40c62debd534f622e53efe1c26859637b1fab31018e730245630476c' 
  AND token = 'OxeDt6Zllzv1WZ8H0y2sMWqVaC7ikei4cMTtntEKblQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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