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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '877715af8117db45d8f50e654b0f70c35e9d3fda1c22d464774ab92f96f98180' 
  AND token = 't10UXHEMFRzAhcI65J/iKVoTdSSlhVYV17PfIC7jxU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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