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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ff0a4b14a70cf10e0e0555f9d218c2747b3536f1248c67e724462c1bf80c260' 
  AND token = 'LnY3VSBT2WUnon4J247EssyzePZzwtBLJpAzQtauP4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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