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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f75c1cb26d51292c9826716ec3a50179e9d6d3b58812157a30794031f006e14b' 
  AND token = '6l1wqY2qZC601rNX9O/O+rFerVEu5aJ2CQ6gNHBGDNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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