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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd646437132b22c4e9a7f015a59e5cea0b7770ec97b3a53308fd60f396c39aab' 
  AND token = '4jzc97KexOWea5rcFrUIyZttfgiObWQRTWsOjB9t+rE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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