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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1bc1d9488370e1564b88a8536cc2da31fa771e5dd195326b180962531c4a677' 
  AND token = 'fC266ZS+5W1j9P995530iy1Yvp3In2JYcxvTasQEAwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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