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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a1014e77e36b7555d1c0a9bd8d81e37d49c0234b1fdd804a5643aabb0f5d2ba' 
  AND token = 'Ku1PG7uIGIh2wbEyTo222nMIFyBmTfYagJaE/odORIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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