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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fffbc3cdc76b886232a2d574d6b278f86d4ecd3b48246b75742a242a1c2800b' 
  AND token = 'Mct2XzhopP6r4jEqA9A5R6uuTj729bCQCPkEtjKH+A0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00348

JSON explain

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