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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7668683b3fb369f4cf1e22dcb0854799e3b2ce3e73573060ae9ec497e2112c1' 
  AND token = 'SzUsfIz5VPQqSsRZlQisa/aYCUqanoarTZVcN9e9lr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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