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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2fb0ad285974e8060be5bc77087518db81b49fb75314b9a411ac688dbc5711d' 
  AND token = '0aHD86+xJfzeGRs+qAXCrs57aRmk3icp0iVuOBpgP7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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