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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddcb8bff64a2c82ada86dbd8df2279ffeac185f094cdce61838544c8612b1256' 
  AND token = 'fDul/aAczG8bIHXEo2mN8Vgy5qGBzQ0TxzberQ+FAO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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