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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eba52bd80b0df3d4bbaa121fc4b4682b52e77865bc803cfbc635854a2883e1d1' 
  AND token = '7ewTQoI8N2iCCYqYBoylrCfT8Wx0mUwF8Wglc9CL2Rc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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