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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '764cad07550877a0ae38d4f5e920bf437b477b126159d819627678651693d4ed' 
  AND token = 'cbxnE6cV6InjjhrunT7yu0gc5wvzefz2JJD5xR9dQOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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