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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa684f4c473a8913f0aa79bd6f5452e7c2bcfbf954afecd264d6df8bef6ca94d' 
  AND token = 'tWPgfj7N9dlb0m2vITmezbu2ZD12O8IFoPSb+xljRyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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