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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57e7e94aa295a9fabe52b5803290a6107d2e214dd9c3d1d0c9ed099beb28ead7' 
  AND token = 'ZFxi03WXVMQShHNG5x+aioYcZX7/pD7iSno5AmpVulw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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