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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4380a9d8b8b1e35b3b651ced519c3aa6c6262efe357687238b32a0fcdeae3a5e' 
  AND token = 'pKbR8O4V1KEoRZgsA0/Vj4KuZamiLTom3A9GzZjNZjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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