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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b6ed54df654f5d4cf724599c69508fd0573e902eb8e277afafe58878d2d33ea' 
  AND token = 'KjMadeYdk9dOunQd6WIOhS2OKUh7jRB0lCwVDfQa/F0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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