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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e88226692298ddf04c541e3af596ae7d8ebc51b4271f2a0d4f9be7eff15af98f' 
  AND token = 'Zw7CRdGLwS9X2Kfeu4+ZrVn0vJlkRvK9+kvbDsbAM3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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