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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7802a012ea40e4deff53bf6bc2abbb98ea4f48e1c8c1ce136346f8b1c35669c4' 
  AND token = 'N9djsnyIykTQpz5stMvMFCM9eCetK5A44DrZBzz7nLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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