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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07e170628f413e322ca95ce232a5546359c0372bcd674179c6d04a574b902299' 
  AND token = '/MPhG5OI5ewEZfPwNlb4yqzsHCI3D+XOOUPdOUeaNCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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