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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbfa53cce90106a708734eefc7521a894004df6fb75f8a26a1e3a2220d91c39b' 
  AND token = 'jqhF8xpcLLWtxMd81CZuIP5Jj+kvBoL4491X31Je7lg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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