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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c059d0cbd0563fa876c0811c7613e5a860eabc0481655c315c42dc1bb8331a4' 
  AND token = 'ibukYti23qzE8cMJoFcNdu9PspleW4OjQ+86n7Lhkp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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