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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55ea0b4e3ac9b2c91787e360af09116da7732a5232129ed3cfd677e61860cc58' 
  AND token = 'OOV6UQXzcFnif/kL8Dd3j56vwb2aLbqy6067BT58zvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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