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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a109285d00443c2fbf565447b82cf7c3e41396dbbc86c1cf064812fc6d04723' 
  AND token = 'cTuBNcTHh55RmQFr8Op3lLNbhdnApRWS9JrET9KAJro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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