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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45ad4461c783708208bbf56265808bc6b18ca577d375e79a3d89972532c6fdbc' 
  AND token = 'lhFvTQY7OTrBM80/etNPno84LpYLihsm0e3Dtii1VDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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