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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea3104fb476aba90c2d697b51abfe70878adc9c0585e25c1b3e49b7dd1216bb6' 
  AND token = '+8HDrkZaB2mTr+PdJo+0XYtF3TTRsGv+P9oObgJclJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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