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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4976a13c838d2998f244c6dad17a5e31bd64a70847368768632a67a078c781d' 
  AND token = 'rLbpZuh/y7MQkepYrkifC+phlKM3vB4k4UlVNsEdiMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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