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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f0a9adbae3b053c936ae53e55816e810b4b78855d7c460345aebea1e10201eb' 
  AND token = 's+9WW3YGBqTiEJAv2EUt/ynk+aGaoeyKcCJrOONP/DA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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