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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '964f21d3c60760007d3b3aa20bf54899ac856725b5aeaf465d8a0d468ffe43e0' 
  AND token = 'GXKufsrswiXIp/PtFQkaNCmiP/l1DP8EdbHrR4fTF+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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