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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92a712d282f92ccb46678cc468c7078ba7e35d24fc0451ab96ba3d81c22dd4ff' 
  AND token = 'clbjyFrYbFQHiTQ/gcWWxigAfde0VmhCtqnDRww0mtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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