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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cc9331fa3b6f2e72aea604bc60be88a54d16cc9fbb4d888dcc84f36f79302a4' 
  AND token = 'KRJiWadL5Vi6NWkUV0IJGFy3BrNPiQ+34xybECwkOKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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