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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed370c329835062904fb669d66f8a9460308d2f6c848d432a41760dd15509d09' 
  AND token = '2kKFz+otZ4+g612Jxh3nZ6Mmi+yt12xDHtqzEuwPv2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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