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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98bb54a03bd0e33902fd78bdf8646320fe7bcf943684bbb0195bd388d655d5ad' 
  AND token = 'tNRLvZouqE/esTAOpXvlQ9csI6cH7TOdNrwaJB00g9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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